First observation of ϕ-meson mass modification in nuclear medium

R. Muto; J. Chiba; H. En'yo; Y. Fukao; H. Funahashi; H. Hamagaki; M. Ieiri; M. Ishino; H. Kanda; M. Kitaguchi; S. Mihara; K. Miwa; T. Miyashita; T. Murakami; T. Nakura; M. Naruki; M. Nomachi; K. Ozawa; F. Sakuma; O. Sasaki; H. D. Sato; M. Sekimoto; T. Tabaru; K. H. Tanaka; M. Togawa; S. Yamada; S. Yokkaichi; Y. Yoshimura

doi:10.1016/j.nuclphysa.2006.06.123

First observation of ϕ-meson mass modification in nuclear medium

R. Muto, J. Chiba, H. En'yo, Y. Fukao, H. Funahashi, H. Hamagaki, M. Ieiri, M. Ishino, H. Kanda, M. Kitaguchi, S. Mihara, K. Miwa, T. Miyashita, T. Murakami, T. Nakura, M. Naruki, M. Nomachi, K. Ozawa, F. Sakuma, O. SasakiH. D. Sato, M. Sekimoto, T. Tabaru, K. H. Tanaka, M. Togawa, S. Yamada, S. Yokkaichi, Y. Yoshimura

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Abstract

We have measured e⁺ e^- invariant mass spectra in 12 GeV p + A interactions at the KEK Proton-Synchrotron. The aim of the experiment is to detect possible in-medium modification of vector mesons at normal nuclear density. We used carbon and copper targets to study the nuclear size dependence of the e⁺ e^- invariant mass spectra. A significant enhancement on the low-mass side of the φ{symbol} meson peak was observed in the low βγ region (β γ_φ{symbol} < 1.25) in the copper data. On the other hand, in the higher βγ region (β γ_φ{symbol} > 1.25), both the spectral shapes obtained from carbon and copper targets were consistent with the expected one from the simulation. This observation is consistent with a picture of the φ{symbol} modification in a nucleus, i.e. normal nuclear density, because such an effect should be visible only for slowly moving mesons produced in a larger nucleus.

Original language	English
Pages (from-to)	723-726
Number of pages	4
Journal	Nuclear Physics A
Volume	774
Issue number	1-4
DOIs	https://doi.org/10.1016/j.nuclphysa.2006.06.123
Publication status	Published - 2006 Aug 7
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/j.nuclphysa.2006.06.123

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Muto, R., Chiba, J., En'yo, H., Fukao, Y., Funahashi, H., Hamagaki, H., Ieiri, M., Ishino, M., Kanda, H., Kitaguchi, M., Mihara, S., Miwa, K., Miyashita, T., Murakami, T., Nakura, T., Naruki, M., Nomachi, M., Ozawa, K., Sakuma, F., ... Yoshimura, Y. (2006). First observation of ϕ-meson mass modification in nuclear medium. Nuclear Physics A, 774(1-4), 723-726. https://doi.org/10.1016/j.nuclphysa.2006.06.123

Muto, R, Chiba, J, En'yo, H, Fukao, Y, Funahashi, H, Hamagaki, H, Ieiri, M, Ishino, M, Kanda, H, Kitaguchi, M, Mihara, S, Miwa, K, Miyashita, T, Murakami, T, Nakura, T, Naruki, M, Nomachi, M, Ozawa, K, Sakuma, F, Sasaki, O, Sato, HD, Sekimoto, M, Tabaru, T, Tanaka, KH, Togawa, M, Yamada, S, Yokkaichi, S & Yoshimura, Y 2006, 'First observation of ϕ-meson mass modification in nuclear medium', Nuclear Physics A, vol. 774, no. 1-4, pp. 723-726. https://doi.org/10.1016/j.nuclphysa.2006.06.123

@article{1bb4b53ddcfe4b5e83c586395701e9e4,

title = "First observation of ϕ-meson mass modification in nuclear medium",

abstract = "We have measured e+ e- invariant mass spectra in 12 GeV p + A interactions at the KEK Proton-Synchrotron. The aim of the experiment is to detect possible in-medium modification of vector mesons at normal nuclear density. We used carbon and copper targets to study the nuclear size dependence of the e+ e- invariant mass spectra. A significant enhancement on the low-mass side of the φ{symbol} meson peak was observed in the low βγ region (β γφ{symbol} < 1.25) in the copper data. On the other hand, in the higher βγ region (β γφ{symbol} > 1.25), both the spectral shapes obtained from carbon and copper targets were consistent with the expected one from the simulation. This observation is consistent with a picture of the φ{symbol} modification in a nucleus, i.e. normal nuclear density, because such an effect should be visible only for slowly moving mesons produced in a larger nucleus.",

author = "R. Muto and J. Chiba and H. En'yo and Y. Fukao and H. Funahashi and H. Hamagaki and M. Ieiri and M. Ishino and H. Kanda and M. Kitaguchi and S. Mihara and K. Miwa and T. Miyashita and T. Murakami and T. Nakura and M. Naruki and M. Nomachi and K. Ozawa and F. Sakuma and O. Sasaki and Sato, {H. D.} and M. Sekimoto and T. Tabaru and Tanaka, {K. H.} and M. Togawa and S. Yamada and S. Yokkaichi and Y. Yoshimura",

note = "Funding Information: We would like to thank all the staff members of KEK-PS, especially the beam channel group for their helpful support. This work was partly supported by the Japan Society for the Promotion of Science, RIKEN Special Postdoctoral Researchers Program and a Grant-in-Aid for Scientific Research of the Japan Ministry of Education, Culture, Sports,",

year = "2006",

month = aug,

day = "7",

doi = "10.1016/j.nuclphysa.2006.06.123",

language = "English",

volume = "774",

pages = "723--726",

journal = "Nuclear Physics A",

issn = "0375-9474",

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number = "1-4",

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TY - JOUR

T1 - First observation of ϕ-meson mass modification in nuclear medium

AU - Muto, R.

AU - Chiba, J.

AU - En'yo, H.

AU - Fukao, Y.

AU - Funahashi, H.

AU - Hamagaki, H.

AU - Ieiri, M.

AU - Ishino, M.

AU - Kanda, H.

AU - Kitaguchi, M.

AU - Mihara, S.

AU - Miwa, K.

AU - Miyashita, T.

AU - Murakami, T.

AU - Nakura, T.

AU - Naruki, M.

AU - Nomachi, M.

AU - Ozawa, K.

AU - Sakuma, F.

AU - Sasaki, O.

AU - Sato, H. D.

AU - Sekimoto, M.

AU - Tabaru, T.

AU - Tanaka, K. H.

AU - Togawa, M.

AU - Yamada, S.

AU - Yokkaichi, S.

AU - Yoshimura, Y.

N1 - Funding Information: We would like to thank all the staff members of KEK-PS, especially the beam channel group for their helpful support. This work was partly supported by the Japan Society for the Promotion of Science, RIKEN Special Postdoctoral Researchers Program and a Grant-in-Aid for Scientific Research of the Japan Ministry of Education, Culture, Sports,

PY - 2006/8/7

Y1 - 2006/8/7

N2 - We have measured e+ e- invariant mass spectra in 12 GeV p + A interactions at the KEK Proton-Synchrotron. The aim of the experiment is to detect possible in-medium modification of vector mesons at normal nuclear density. We used carbon and copper targets to study the nuclear size dependence of the e+ e- invariant mass spectra. A significant enhancement on the low-mass side of the φ{symbol} meson peak was observed in the low βγ region (β γφ{symbol} < 1.25) in the copper data. On the other hand, in the higher βγ region (β γφ{symbol} > 1.25), both the spectral shapes obtained from carbon and copper targets were consistent with the expected one from the simulation. This observation is consistent with a picture of the φ{symbol} modification in a nucleus, i.e. normal nuclear density, because such an effect should be visible only for slowly moving mesons produced in a larger nucleus.

AB - We have measured e+ e- invariant mass spectra in 12 GeV p + A interactions at the KEK Proton-Synchrotron. The aim of the experiment is to detect possible in-medium modification of vector mesons at normal nuclear density. We used carbon and copper targets to study the nuclear size dependence of the e+ e- invariant mass spectra. A significant enhancement on the low-mass side of the φ{symbol} meson peak was observed in the low βγ region (β γφ{symbol} < 1.25) in the copper data. On the other hand, in the higher βγ region (β γφ{symbol} > 1.25), both the spectral shapes obtained from carbon and copper targets were consistent with the expected one from the simulation. This observation is consistent with a picture of the φ{symbol} modification in a nucleus, i.e. normal nuclear density, because such an effect should be visible only for slowly moving mesons produced in a larger nucleus.

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U2 - 10.1016/j.nuclphysa.2006.06.123

DO - 10.1016/j.nuclphysa.2006.06.123

M3 - Article

AN - SCOPUS:34347398556

VL - 774

SP - 723

EP - 726

JO - Nuclear Physics A

JF - Nuclear Physics A

SN - 0375-9474

IS - 1-4

ER -

First observation of ϕ-meson mass modification in nuclear medium

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